Jorgen Schäfer added the comment:
I do not understand how your comments apply to this bug. There is no
comment anywhere. There is a single string literal whose contents look
like a comment. The expression parses correctly without syntax error if you
add a few newlines in front. Could you clarify your objection?
On Aug 22, 2014 9:59 PM, "Terry J. Reedy" <rep...@bugs.python.org> wrote:
>
> Terry J. Reedy added the comment:
>
> This issue is about the SyntaxError message for eval functions, not the
> ast module per se. My first response is that the reported message is not a
> bug and that this issue should be closed as 'not a bug'.
>
> (General reason) Trying to eval an expression preceded by a comment on its
> own line or followed by a comment works.
>
> >>> eval("#before\n'string'#after")
> 'string'
>
> Trying to eval a bare comment *is* a syntax error.
>
> >>> eval("#comment\n")
> ...
> SyntaxError: unexpected EOF while parsing
>
> So the issue as presented is the special-case message. However, messages
> are not part of the language specification and improving them is
> often/usually/always? treated as an enhancement. Changing them will break
> code and tests that depend on the exact wording. 2.7 does not get
> enhancements.
>
> (Specific reason) In 2.x, the input to (literal-)eval is either latin-1
> encoded bytes or unicode. 'Latin-1' input could potentially consist of an
> encoding declaration on one line followed on the next line by a literal
> string encoded as indicated.
>
> >>> le("# -*- coding: utf-8 -*-\n'string'")
> 'string'
>
> Unicode input, the subject of this issue, is encoded to latin-1, which
> means that any literal string in the expression has to be latin-1 encoded.
> Therefore, a latin-1 encoding declaration is redundant and anything else is
> either redundant (if the original unicode only contains characters that
> encode the same in latin-1, as in the example above) or wrong, with hard to
> predict behavior. Someone thought it worthwhile to add the special case
> check. I think it should be left as is.
>
> Jorgen, please either close this or explain why you think not, in light of
> the above.
>
> ----------
> nosy: +terry.reedy
>
> _______________________________________
> Python tracker <rep...@bugs.python.org>
> <http://bugs.python.org/issue22221>
> _______________________________________
>
----------
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue22221>
_______________________________________
_______________________________________________
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
